Smoke-consuming furnace.



P. J. KRABTSGH.

SMOKE GONSUMING FURNACE.

APPLIGATION FILED MAY 11, 190s.

Patented May 2, 1911.

3 SHEETS-SHEET 1.

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Patented My 211911.

P. J. KRAETSOH.

l SMOKE GONSUMING FURNAGE. APPLIOATION FILED MAY 11, 1908 991,326. v

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wL'frSSes PAUL J. xnAiiTsoH, or mis ivioiivns, IOWA.

SMOKE-CONSUIVIING FURN'ACE.

Specification of Letters Patent.

Application filed May 11, 1908.

Patented May 2, 1911. serial No. 432,239.

To all whom it may concern:

Be it known that I, PAUL J. KRAiirsoH, a citizen of the United States, residing at Des Moines, in the county of Polk and State of Iowa, have invented a certain new and useful Smoke-Consuming Furnace, of which the following is a specification.

The object of my invention is to provide a smoke consuming furnace of simple, durable and inexpensive construction, that may be readily and easily operated by a reman, so that all of the volatile gases, smoke, and soot arising from the fuel on the grate may be consumed and utilized in heating the boiler.

My invention consists in the construction, arrangement and combination of the various parts of the device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in my claims, and illustrated in the, accompanying drawings, in which Figure 1 shows a front elevation of a furnace embodying my invention. Fig. 2 shows a sectional view on the line 2 2 of Fig: 3. Fig. 3 shows a longitudinal, sectional view of a complete furnace embodying my invention, taken on the line 3 3 of Fig. 2. ig. 4 shows a vertical, transverse, sectional view, taken on the line 4 4 of Fig. 3. Fig. 5 shows a detail, sectional view on one side of the furnace in front of the bridge wall, taken directly under the boiler. Fig. shows'an enlarged, detail, sectional view illustrating the box for containing the force draft steam pipe and the damper, and Fig. 7 shows a sectional, perspective view of the rear end of same.

Referring to the accompanying drawings, I have used the reference numeral 10 to 1ndicate the boiler, 11 the outside furnace walls, and 12 the bridge wall, all of which are of the ordinary construction and arranged in the ordinary manner. Between the bridge wall and the furnace front at the longitudinal center of the boiler is a partition wall 13 having a large smoke opening 14 at its upper portion. On opposite sides of this bridge wall 13, are the grates 15 which are also of ordinary construction.

In the furnace front the usual doors 16 are provided in front of each grate.

Arranged below the longitudinal center of the boiler, above the partition wall 13, is a cast metal box, comprising a Hat top 17, two side portions 18 extending downwardly and outwardly from the top, and two side portions 19 extending downwardly and inwardly toward each other from the lower ends of the parts 18. In the sides 19 are the draft openings 20. The front of the box is preferably open as shown in Fig. 6.

Mounted in the box is a damper plate 21, pivoted at its lower portion and provided with a handle 22 extending in front of the furnace. This damper plate` is capable of lying flat against either one of the sider portions 19 to thereby close the openings 2O in said side.

Arranged in the top of the box above the damper plate is a steam pipe 23, capable of rocking movement and having a series of openings 24 arranged in line with each other. A handle 25a is attached to the forward end of this pipe whereby the pipe may be turned, so that the openings 24 therein Will be in line with the openings 2O in either one of the sides 19, that is to say, when the pipe 23 is in one position of its movement, steam discharged through the openings 24 thereof will pass through the opening 20 in one of the sides 19, and when it is rocked to its other position, steam will pass through the openings 24 and through the opening 20 in the other one of the sides 19, it being understood, of course, that the damper plate 21 is correspondingly arranged to permit this operation.

Resting against the sides 18 of the steam box are two brick arches 25 which extend from said box to the adjacent side walls of the furnace and which are spaced apart from the boiler. These arches extend from the front of the boiler to a point spaced apart yfrom the bridge wall 12 and theii` function will be hereinafter made clear. In this connection, however, it is to be noted that the steam box serves the double function of providing for the mixture of steam with the products of combustion and of supporting these arches.

The numeral 26 indicates a steam pipe connected with the steam pipe 23, a valve 27 being provided to control the communication from the pipe 2G to the pipe 23. Two branch pipes, 28 and 29, are also connected with the pipe 26 and are controlled by valves 30 and 31. These pipes extend rearwardly from the front of the arch 25 and thenlaterally at 32 across the rear end of the arch and are provided with openings to discharge steam rearwardly over t-he opening between the rear of the arch and the top of the bridge side of the partition wall 13, is a vertically slidable draft plate 33; on the front face of each is a perforated protecting plate 34. Mounted adjacent to the plates 33 is a lever 35, fulcrumed at 36 and having a pivotally sliding connection with the plates 33. A rod 37 is connected to the said lever and extends to the point in front of the furnace where'it is provided with a socket 38 to receive a handle whereby the rod may be rocked. Obviously, when the lever 35 is in one position one of the draft plates 33 is at its upper limit of movement and shuts off the passage of the products of combustion under the boiler on one side, and the other plate is in position to permit the products of combustion to pass toward the rear of the boiler. Then the position of the lever is reversed, the first mentioned plate is lowered and the other one elevated.

In the furnace front are two openings covered by slides 39, for the purpose of admitt-ing air in limited quantities to the spaces above the bridge walls 12, and said air when passed over the bridge walls and discharged in the rear thereof, will be heated to such an extent that it will readily unite with the products of combustion and aid in burning the smoke and soot.

In practical use, and assuming` that a smokeless fire is burning on the right grate and it is desired to add fresh fuel to the left grate, then the operator closes the left draft plate 33 and he also turns the damper plate 21 to the left as shown in Fig. 2, and he also turns the pipe 23 to position where it will discharge through th-e openings 20 in the right side of the box 19 as shown in Fig. 7. This will, cause all of the products of combustion arising from the left grate to pass through'the opening 14 in the central partition 13. While the products of combustion are passing through said opening 1% the jets of steam from the pipe 23 will be forced downwardly toward the center of the fire upon the right grate and they will thoroughly commingle with the products of' combustion and force them close to the hot fire on the right grate where all of the volatile products of combustion will be consumed and thus the fire on the right grate will be made much hotter and the products of combustion will pass over the bridge wall 12 on the right side and then rearwardly along the boiler to its rear end, so that all of the heat arising from both fires will be utilized to its maximum extent in heating the boiler. If, at any time, it should be found that there is not sufficient fresh air introduced into the fire the operator may open the slide 39 on the side along which the products of combustion are passing to the rear end of the boiler, so that fresh air will then pass close to the top of the arch 25 and will mingle with the products of combustion between the arch and the bridge wall. In the event that it is desired to force the draft and also aid in the combustion of the smoke and gases arising from the fire, then steam is admitted through one or the other of the pipes 28 and 29 and this steam is discharged into the products of combustion between the arch and the bridge wall on the side along which the products of combustion are traveling to the rear of the boiler.

The box in which the steam pipe Q3 is contained serves a number of useful functions. In the first place it contains the damper plate 21 and the steam pipe 23 and is so arranged that steam may be discharged through either side of it. In addition to this, the box is so shaped that it forms a central support for the two arches 25. The front end of the box is open as clearly shown in Fig. 6, so that fresh air may enter it and be commingled with the steam and thus aid in combustion. This admission of fresh air also serves to prevent the box from burning out.

The construction shown is very simple. and inexpensive and the entire device may be attached to an ordinary boiler furnace quickly and easily and at slight expense.

The pipe 26 and the branches thereof are preferably employed for the introduction of steam to the various parts of the furnace. It is obvious, however, that air under pressure may be used in the same manner and with substantially the same effect. Therefore, in the specication and claims, where I have used the word steam it is intended to be construed as meaning either steam or air or the like.

I claim as my invention.

1. In a furnace, the combination of two grates, a partition wall between them having an opening therein, a draft plate in the rear of each grate arranged to close the passage way from the grate t0 the flue and to compel the products of combustion arising from the grate to pass through the opening in the partition wall, a hollow box arranged at the top of said opening and having a series of openings to discharge downwardly and toward one of the grates, and a second series of openings to discharge downwardly and toward the other grate, means for closing either one of said sets of openings, and means for introducing steam into said box.

2. In a furnace, the combination of two grates, a partition wall between them having an opening therein, a draft plate in the rear of each grate arranged to close the passage way from the grate to the flue and to compel the products of combustion arising from the grate to pass through the opening in the partition wall, a hollow box arranged at the top of said opening and having a series of openings to discharge downwardly and toward one of the grates, and a second series of openings to discharge downwardly and toward the other grate, means for closing either one of said sets of openings, and means for introducing steam into said box, and an arch extended over both grates from the furnace front to a point a short distance in the rear of said opening in the partition.

3. In a furnace, the combination of two grates, a partition wall between them having an opening therein, a hollow box arranged at the top of said opening and having passage ways in its sides, a damper plate in said hollow box arranged to close the passage ways on either side, a steam pipe within said box, a vertically movable draft plate in the rear of each grate to close the passage way from the grate to the Hue, and means for holding one of said plates in an open position and the other in a closed position.

4. In a furnace, the combination of two grates, a partition wall between them having an opening therein, a hollow box arranged at the top of said opening and having the upper portions of its sides extended downwardly and outwardly away from each other, and the lower portions of its sides extended downwardly and toward each other,

the latter portions having draft openings therein, a damper within the box capable of lying flat against the lower portion of either side, and two arches having their adjacent edges resting against the upper portions of the sides of the box, and means for introducing steam into said box, said means comprising a pipe having openings along one side, said pipe being capable of turning within the box, so that the openings therein may be placed in line with the openings in either one of the sides and a handle connected with said pipe for turning it, and means for directing the products of combustion from one grate through the opening in the partition and over the other grate.

5. In a furnace, the combination of two grates, a partition wall between them having an opening therein, means for directing the productsl of combustion from one grate through the opening to the other grate, a box located at the top of said opening and provided with openings to admit air at its front and discharge air downwardly and toward the grates, a steam pipe introduced into said box, and means for directing the combined steam and air owing through the box in a direction toward either grate.

6. In a furnace, the combination of two grates, a partition wallbetween them having an opening` therein, means for directing the products of combustion from either grate through the opening in the partition to the other grate, a box located at the top of said opening and having openings in its sides, and also having its front end open, a steam pipe within the box, a damper plate within the box capable of closing the opening in either side of the box, and means for forcing steam from said pipe through the interior of the box and through the openings in either side thereof.

7. In a furnace, the combination of two grates, a partition wall between them having an opening therein, means for directing the products of combustion from either grate through the opening in the partition to the other grate, a box located at the top of said opening and having openings in its sides, and also having its front end open, a steam pipe within the box, a damper plate within the box capable of closing the opening in either side of the box, and means for forcing steam from said pipe through the interior of the box and through the openings in either side thereof, and an arch over both grates, the inner edge of each arch being supported by the said box, and means for introducing air from the front of the furnace above each arch.

8. In a furnace, the combination of two grates, bridge walls in the rear of the grates, a partition between the grates having an opening therein, a hollow box at the top of said opening having perforations in its sides,

a damper within the box capable of closing the opening in either side, a steam pipe within the box having perforations in one side, means for rocking the steam pipe to direct steam through the interior of the box and through the opening in either side thereof, the front end of said box being open to admit air, two arches having their edges resting` upon said box and extended over the grates, and also extended from the front of the furnace to points spaced apart from the bridge walls, two draft plates slidingly mounted in the rear of the bridge walls to control the passage way from the grates to the flue, a lever connecting them and so arranged `that when one is in an open position, the other will be closed, and a rod connected with said lever and extended to the furnace front.

9. 1n a furnace, the combination of two grates, bridge walls in the rear of the grates, a partition between the grates having an opening therein, a hollow box at the top of said opening having perforations in its sides, a damper within the box capable of closing the opening in either side, a steam pipe within the box having perforations in one side, means for rocking the steam pipe to direct steam through the interior of the box and through the opening in either side thereof, the front end of said box being open to admit air, two arches having their edges resting upon said box and a steam pipe arranged above each arch and extended over the grates, and also extended from the front of the furnace to points spaced apart from the bridge walls7 two draft plates slidingly mounted in the rear of the bridge walls to control the passage way from the grates to the flue, a lever connecting them and so arranged that when one is in an open position, the other will be closed, and a rod connected with said lever and extended to the furnace front, and

extended across the rear of the arch and having openings therein to discharge steam rearwardly through the rear of the arch 15 toward the bridge wall.

Des Moines, Iowa, May 7, 1908.

PAUL J. KRAETSCH.

lVtnesses RALPH Onwre, MILDRED B. GOLDIZEN.

Copies of this patent may be obtained for five cents each, by addressing che Commissioner of Patents,

A Washington, '.D. C. 

